Rad sizing on living room + extension

[TeaTime]

After some advice really.

My living room was extended a few years back, so part of it has another floor above it and part of it just has an extension with a flat roof and double sliding doors, all of which (the extension) is exposed. Where as the original lounge is only two walls exposed.

How would I go about doing rad sizing?

Do I treat them as two seperate rooms?

Thanks in advance for your input.

TT

 

[PrenticeBoyofDerry]

If you have walls and doors creating a room then calculate individually
If an open design, then treat as one, as heat will go to cold.
It maybe best to actually have more than one heating panel.